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You will clear immigration in Bangkok only, your flight Bangkok to Phuket will be a domestic sector so no immigration. 90min is very less I supposed. You better contact your airlines transfer facilities staff.. They will forward your applications for quick clearance but that should also be 1 hour atleast. Direct look for Group immigration visa, that queue will be manageable for your Airlines.. Individual visa line will be too long to jump out of turn. Happy holidays ☺️
UpvoteCommentThanks,